Tim Roache, GMB general secretary, said: ‘It’s no wonder people are knackered.

‘Too many workers struggle on low pay, often working more than one job to pay the bills.’

He added: ‘Long hours and long commutes, juggling family life and childcare, too many in insecure work and not knowing what hours you’ll get tomorrow or next week – it takes its toll, and not just in having a kip on the bus or between stops on the train.

Zonked out on the tube: Commuters asleep on the train

‘It takes its toll on your whole life.

‘If politicians are serious in this election about helping working people, they’ll make sure work pays and that people have secure jobs and proper rights when they’re there.’